<!DOCTYPE html>
<html lang="en">
	<head>
		<meta charset="UTF-8">
		<meta http-equiv="X-UA-Compatible" content="IE=edge">
		<meta name="viewport" content="width=device-width, initial-scale=1.0">
		<title>Document</title>
		<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.6/umd/popper.min.js"></script>
		<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.2.1/css/bootstrap.min.css">
		   
		<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js"></script>
		   
		<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.2.1/js/bootstrap.min.js"></script>
	</head>
	<body class="container">

		<div class="btn-toolbar mb-2" role="btn-toolbar" aria-label="Toolbar with button groups">

			<div class="btn-group mr-2" role="group" aria-label="First group">
				<button type="info" class="btn btn-secondary">1</button>
				<button type="info" class="btn btn-secondary">2</button>
				<button type="info" class="btn btn-secondary">3</button>
				<button type="info" class="btn btn-secondary">4</button>
				<button type="info" class="btn btn-secondary">5</button>
			</div>
			<div class="input-group">
				<div class="input-group-prepend">
					<div class="input-group-text" id="btnGroupAddon">@</div>
					<input type="text" class="form-control" placeholder="邮箱">
				</div>

			</div>

	</body>
</html>
